Perhaps you have misunderstood the terminology in the script. "Wallpaper" in the script refers to the plymouth splash (which is not your desktop wallpaper). It is the screen you see after the grub screen and before the login (lightdm) screen. By the way if you are seeing characters roll by before the plymoputh splash and don't want to, you must add the option "quiet" to your boot string.
TC
TC
All opinions expressed and all advice given by Trinidad Cruz on this forum are his responsibility alone and do not necessarily reflect the views or methods of the developers of Linux Lite. He is a citizen of the United States where it is acceptable to occasionally be uninformed and inept as long as you pay your taxes.